24 mm, 35 mm, 50 mm, 85 mm sets of fixed focus are used to shoot what is the best photographic material for its focal length.

35mm: Landscape, Landscape Portraits and Documentaries

50 mm: small scene, full-length portrait, documentary

85 mm: small scenes, close-up portraits, documentaries

Supplement:

If you only choose two, it should be one long and one short.

It is recommended to choose 24mm and 50mm ports.

The reason for this is the following：

1, two kinds of focal lengths can deal with wide angle and portrait respectively. If the zoom lens is not considered, these two lenses can cope with most subjects in life.

2. In a short-focus lens, the field of view of 24mm is much wider than that of 35 mm.. If you encounter a grand landscape theme, 35 mm will be very stretched, while 24mm will be more comfortable. On the aps-c SLR fuselage, this gap is even more obvious.

Among 3.85mm and 50mm, 50mm is more versatile, because the viewing angle is more natural and the composition is better controlled. 85mm medium focus, if used on APS-C, is almost 135, belonging to telephoto, with narrow viewing angle, which is difficult to control.